* {
  margin: 0;
  padding: 0;
}
body {
  width: 100vw;
  height: 100vh;
  background: radial-gradient(darkcyan, darkblue);
}
.center {
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%) rotateX(45deg);
  width: 20px;
  height: 10px;
  border: 1px solid aqua;
  border-radius: 50%;
  animation: waveMove 5s infinite;
  opacity: 0.5;
}
@keyframes waveMove {
  10% {
    top: calc(50%+5px);
  }
  20% {
    top: calc(50%-5px);
  }
  30% {
    top: 50%;
  }
}
.drip {
  position: absolute;
  left: 50%;
  top: 0;
  width: 2px;
  height: 20px;
  border-radius: 50%;
  background: aqua;
  transform: translate(-50%);
  animation: drip 5s infinite -10.3s;
}
@keyframes drip {
  0% {
    opacity: 1;
    top: 0;
  }
  10% {
    opacity: 0.2;
    top: 50%;
  }
  20% {
    opacity: 0;
    top: 50%;
  }
  100% {
    opacity: 0;
    top: 50%;
  }
}
